What conditions would be necessary to have all of the world's mainland animals be subjected to island gigantism?

Most of the humans on my alternate universe's Earth have gone extinct due to a global war, leaving a handful of survivors and the buildings to serve as a reminder of how great they once were. This severely dropped humans on the food chain, and to make the overall world more interesting, I wanted animals to evolve in both size and ferocity.

The survivors the story focuses on aren't living in the far future, only little over a century after the war. Would evolution in animals be able to happen this fast, and would island gigantism even be possible on continents?

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What conditions would be necessary to have all of the world's mainland animals be subjected to island gigantism?

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